Carburetor



WA/ESSES a MAX/m3 Y 7 Feb. s., 1924, 1,482,773 E. L. WALT-ERS CARBURETORFiled April 11. 191 v2 .Sheets-Sheet? Patented F eb. 5, 1924.

UNITED STATES PATENT OFFICE.

ELZA. L. WALTERS, OIE` ANDERSON, INDIANA.

CARBURETOR.

Application led April 11, 1919. Serial No. 289,226.

bustionengines forcreating a mixture of air and fuel which is utilizedas the fuel medium for operating this type of engines.

The invention aims to provide a carburetor embodying a relatively smallnumber lof parts and which whenk adjusted operates automatically at low,high or any intermediate speed, the valves automatically adaptingthemselves to the varying speeds so asV to produce a mixture ofY air andfuel which insures a nearly perfect combustion,

thereby preventing the accumulation of carbon.

The drawings illustrate a preferred ernbodiment of the invention.However, it is to be understood that in adapting the same to meetdifferent conditions, various changes in the form, proportion,'and minordetails of construction may be resortedto without departing from thenature of the invention as claimed hereinafter.

Referring; to the accompanying -drawings which illustrate a carburetorembodying the invention, Y

Figure 1 is a horizontal section through the mixing tube, the floatchamber being shown in plan.

Figure 2 is an end elevation, the chamber being shown in section.

Figure 3 is an end elevation ofthe mixing tube partly broken away toshow the stop for limiting the movement of the throttle.

y float Fig. 1 is a section of the float and parts` associated therewithon the line 4-4 of Fig. 2, the chamber being omitted.

Fig. 5v is an end elevation of the fuel valve, and

Fig. 6 is a section on the line 6-6 of float chamber 1 and a mixing`tube 2 which are connected in any suitable manner as by casting or by abracket 3.

The float chamber 1 is closed at its top by means of a cover 4 in whichis formed a threaded opening to receive the reduced externally threadedend of a tube 5. Slots 6 are formed in opposite sides of the inner orlower end of the tube 5 to receive a bar 7 which projects beyondopposite sides of the tube to engage. a float 8. The center portion ofthe bar 7 is widened and apertured to receive the lower pointed end of avalve 9 which controls the flow of the liquid fuel through the tube 5into the float chamber. A valve seat 10 is formed at the inner end ofthe reduced portion of the tube 5 and the valve 9 closes upwardlythereagainst, the upper. end Aof the valve being pointed to enter thereduced portion of the tube 5 and the shoulder formed at the base of thereduced end constituting the valve proper which closes on the seat 10.The tube 5 remains fixed after beingadjusted, but the float 8 and valve9 are movable and are controlled intheir movements by the change oflevel of the fuel in the chamber 1. A pin 1,1 supported in the lower endof the tube 5 has its end portions projecting to engage the float 8 andlimit the downward movement of the float and the valve 9. The float 8 isfreely movable on the tube 5 and the opening through which the tube 5passes is provided with a metal lining or sleeve 12. The end portions ofthe bar 7 pass through the lining 12 and float 8, thereby serving toretain'the lining or sleeve 12 in position.

. VThe metal lining 12 prevents any binding of the floaton the tube 5. Athimble or coupling 13 is fitted in an opening formed in the bottom ofthe float chamber 1 and constitutes an outlet for the fuel. A pipe 14connects with ythe coupling or thimble 13 and conveys the fuel from thefloat chamber to the mixing tube.

A pin 15 is .loosely mounted on the cover 4 and enables the carburetorto be primed when the valve 10 is unseated by the engagemcnt of the-pin15 with the float 8. While the valve 10 is kept open, fuel will continueto flow into the chamber through the tube 5, consequently raising thelevel of the fuel in the mixing chamber, the over- Y flow being used forpriming purposes.

Y bracket 17, which bracket is secured to the lever 16 is pivotallymounted vupon the projectingend of the tube by means of a nut 18. Thisnut-18 also acts as a binder to secure the tube 5 in adjustedposition-in Vthe chamber 1. The lever 16 has one of its adapted to beoperated by the usual control lever 'in a manner Well understood. A setscrew 20 is threaded into the side of the mixing tube2 and maybeadjusted -to limit the movement of the throttle 19. A bushing 21 isthreaded intothe opposite end of the mixing'tube 2 ,and adjustablyreceives a valve seat 22 which is kconnected thereto by means yo'fcooperating screw threads to per# mit adjustment of the valve seat 22 soas y air enters the tube24 and mixeswith the to enable the air valve 23to be seated thereon with greater or less facility as may be required.

An air tube 24 is disposed centrally ofA the' mixing tube 2 and issupported by means cfa bridge 25 and yafuel nozzle 30 extendingtherethrough. 'The valve 23 is movable on theair tube 24 and is normallyheld seated 1 bymeans of an expansible helical spring 26 f other endsthreaded and passing through the bushing 21. vNuts 28 are nsecured tothethreaded end of the rods 27 to hold the 'bridge in adjusted position.

Locking elements Y29 may be used to hold the nuts 28 in positionby'vvedging said lelements 29 betvveenthe nuts 28 and the valve seat 22as shown in Figure 2.

A fuel nozzle 30 Vextends through a side of the mixing tube 2 and vaside of the air tube 241 and has its inner end terminating in an outlet31 within the air tube 24. A small diagonal opening 31 is -provided atthe rear "of the outlet to act as an additional ventfor thefuelvnozzle30, said fuel nozzle having its outer end connected to the pipeV 14 toreceive theV fuel from theicha'mber 1. A needle `valve 32 is connectedlto the air Vvalve 23 to move therewith by a U-shaped rod 33 which .isadjustable on the air valve 23 so as to regulate' the fuel outlet vforidlingor for constant low speed. The valve 32 is mounted at the closedend Yof the U-shaped rod'33 the free ends of said'rod lbeing threadedand passing through the bridge 25 and the valve 23. Nuts 34 are securedto the threaded endsV of the rod 33 to adjust said rod on said valve 23.Brackets 35 secured to the inner Walls of the mixing tube 2 act asguiding means in conjunction with the bridge 25 for the rod 33. 1

A fuel pipe, not shown, is adapted to be coupled with the projecting endof the tube 5 While the mixing tube 2 is adapted to be connected in anysuitable manner to theintakemanifold ofthe engine. It is apparent thatthe several parts maybe properly adjusted by setting the tube 5, valveseat 22 and fuel valvev 32. The valve seat 22gmay be adjusted by turningit upon the bushing '21' whereby the air valve` 23 and needle valve "32are Vmoved accordingly. Ifit is desired to' furtheradjust the needlevalve 32 without moving the air Avalve 23,-sofas` to Vpermit aslovv'feeding of fuel therethrough for idling, said adjustment may bevmade onv the rod 33 by the nuts 34. VIf it is desired to increase thetension of thespring 26 on the valve 23, the bridge 25 is movedfforwardby'tightening the nuts 28 on the rods 27. Y Y

`When the engine is running at low speed fuel drawn from the outlet 3l.vAs thespeed of the engine increases the increased suction unseats theair valve23 more or less, thereby admitting'of a greater volume of airvbeing drav'n intothe lmixing tube. The unseating of the airvalve 23effects proportionate opening of the valvef32, whereby more fuel lissupplied to mix with the greater volumel of air. This action isautomatic as Will-be readily understood. The oat 8inth`e cham" flutingof the carburetor While at the 'same time assuring properl and amplesupply of fuel When'the engine lis running atlow speed and whenstarting. Should theV float 8 or.` 'Y

valve 9 stick, the same may-be moved VKby operating the priming lever 16ina manner well understood.

The foregoing description and thev draw- 'ings have reference to Vwhatmaybe considered the preferred, or'approved form of.

my invention. It is to be understood that `I may make such Vchanges inconstruction and arrangement and combination of parts,

materials, dimensions, etcetera, as may prove expedient and fall Withinthejso'ope of the appended claim. Y

Having thus fully described my inven--K` `tion, what I claimY las newand desire to secure by Letters Patent 1s:-` f v In a carburetor, amixing tube having an air openino` an air tube means for supplyingfuutaeaa mbe, a au regnaang valve, a valve seat adjustable in the airopenvalves and adapted tovbe guided in its move- 10 ing, an airk valveseated on the valve seat ment by said bridge.

and mounted on the air tube, an expansible In testimony whereof I alixmy signature helical spring mounted on the air tube and in presence oftwo Witnesses.

a holding the air valve Seated, a bridge for supporting the air tube andengaging one ELZA L. WALTERS. end of the Spring, means for adjusting theWitnesses: v bridge to vary the tension of the spring and LOREN REED,

means adj ustably connecting the air and fuel J. O. PENISTEN.

